It is a good idea to reconnect the Display and check to see if the battery will charge and the system turns on prior to reassembly. This makes sure that your battery connection is good and that your display connection is good. You don’t want to reassemble the phone only to find out your battery connection isn’t good. Just note that the speakers only work once the display is in place and is making contact with the back board. Testing the battery and display may warrant being another step or section.
Note that there are several strips of glue along the edges of the display which will need to be reapplied during reassembly.
When cleaning the Glass Panes, DO NOT use metal tools, This will scrape the paint off of the back of the glass and damage the glass. Use of Alcohol helps loosen and remove the glue. I used a small plastic scraper and alcohol. Just takes a little bit of time.
I was unable to get the iOpener to heat the glass panes hot enough to loosen the glue. I was able to use a heat gun. Just heat it on low setting for about 1.5 min. (Any longer and you risk damaging the phone.